SCCF Ball Field Sink

2026-11-03

Excavation : Contractor shall excavate all loose , soft , organic , or unsuitable material in and around the existing sinkhole to a depth of twelve ( 12 ) feet or until competent , stable subgrade material is reached . Contractor shall report any necessary adjustments to depth beyond twelve ( 12 ) feet directly to the Facility Manager and shall receive written approval from the State prior to proceeding with any adjustments that increase the depth of the excavation area beyond twelve ( 12 ) feet . Contractor shall cut back side slopes as necessary in order to ensure stability and worker safety in accordance with OSHA trenching and excavation standards . If groundwater is encountered , Contractor shall provide dewatering measures as necessary in order to maintain a stable and workable excavation . Subgrade Preparation : Upon completion of excavation , Contractor shall visually inspect the subgrade for confirmed stability and proof - roll , as necessary , with appropriate equipment . Prior to installing geofabric or any rock , Contractor shall complete an inspection of the subgrade with the Facility Manager or designee present . Any defects discovered in the subgrade shall be the responsibility of the Contractor to fix at no additional cost to the State . Once the subgrade inspection is complete and subsequent approval to proceed is provided by the State , Contractor shall furnish and install non - woven geotextile fabric on the subgrade . Fabric shall extend fully across the excavation bottom and up sidewalls as necessary to prevent migration of soil into the stone backfill and shall be installed flat , free of wrinkles , and overlapped a minimum of eighteen ( 18 ) inches at all seams . Backfill and Final Grade : Contractor shall furnish and install 4 - inch to 12 - inch diameter filter rock in the excavation . Rock shall be clean , durable , and free of organic material . Contractor shall use the necessary procedures and equipment to minimize voids . Contractor shall backfill rock until its elevation is within twelve ( 12 ) inches of the original finished ground elevation . The remaining twelve ( 12 ) inches shall be filled with clean , compactable soil . The soil shall be suitable for the region ’ s climate and shall be free from pests and diseases . Contractor shall place soil in uniform horizontal lifts not exceeding eight ( 8 ) inches in loose thickness and shall compact the soil using appropriate mechanical compaction equipment . No additional fill shall be placed until the preceding lift has been properly compacted . Each lift shall be compacted until the soil is dense and unyielding and achieves not less than ninety - five ( 95 ) percent of the maximum dry density as determined by ASTM D698 . Final grade shall be uniform , free of low spots , and match existing surrounding contours to ensure proper surface drainage ...

Tennessee

2026-05-05